Synchrocheck States; Synchrocheck Internal States - GE Multilin F650 Instruction Manual

5.5 CONTROL ELEMENTS
This time is considered if the relative slip is higher than 5 mHz; in this case, an anticipative algorithm is
executed to calculate the closing signal with the necessary advance for the breaker effective Closing to be
produced when voltages are in phase. In case the frequency slip is high (higher than 5 Hz) and it is not
possible to obtain a closing in phase, the used algorithm ensures that the voltage difference in the moment
of the closing is lower than the set angle (Max Angle Difference).
Closing permission logic setpoints:
In case that the voltage at one or both ends of the breaker is null, the synchronism unit cannot establish the necessary
parameters to give closing conditions, and therefore it does not issue synchronism permission. For those situations where
the user wants to enable the closing permission in a condition of loss of one or both voltages at both ends of the breaker,
F650 units incorporate closing permission logics for the cases of: dead line-dead bus, live line-dead bus and dead line-live
bus.
Dead line- Dead Bus Function permission (DL-DB Function): Enabling this Function allows issuing a
Closing permission signal in dead line and dead bus Condition (without voltage at both sides of the breaker).
Live line- Dead Bus Function permission (LL-DB Function): Enabling this Function allows to issue a
Closing permission signal in live line and dead bus Condition (without voltage at the sides of the breaker that
corresponds to the busbar voltage)
Dead line- Live Bus Function permission (DL-LB Function): Enabling this Function allows issuing a
Closing permission signal in live line and dead bus Condition (without voltage at the sides of the breaker that
corresponds to the line voltage).
Snapshot event: The snapshot event setpoint enables or disables the snapshot event generation for this unit.
5

5.5.4.4 SYNCHROCHECK STATES

Internal signals provided by the F650 (Actual> Status > Control Elements > Synchrocheck) for the synchronism unit are as
follows:
Table 5–73: SYNCHROCHECK INTERNAL STATES
SYNCROCHECK BLK INP:
SYNCROCHECK OP:
SYNCHK CLOSE PERM:
SYNCROCHECK COND OP:
5-82
SYNCHROCHECK ACTUAL VALUES
SYNCROCHECK BLK INP
SYNCROCHECK OP
SYNCHK CLOSE PERM
SYNCROCHECK COND OP
DL-DB OPERATION
DL-LB OPERATION
LL-DB OPERATION
SLIP CONDITION
BUS FREQ > LINE FREQ
BUS FREQ < LINE FREQ
Block signal for the synchrocheck unit, configurable at Setpoint > Relay
Configuration > Protection Elements
Closing permission signal in live line-live bus conditions with open breaker.
General Closing permission of the Synchronism unit. It contemplates all possible
situations, live line-live bus conditions, and the closing permission logics (dead line-
dead bus, live line- dead bus, dead line-live bus). Note: in case the Function is
disabled, the Closing permission signal will be activated in order not to interfere with
possible logics where it is included. If the synchronism unit is enabled, this signal will
only be activated in the closing conditions established by setpoint.
Closing permission according to permission logics (DL-DB, LL-DB, DL-LB).
DL-DB OPERATION: Closing permission in dead line – dead bus condition.
F650 Digital Bay Controller
5 SETPOINTS
GE Multilin